Bulldozer Rampage In Granby, June 4, 2004
To make the bulldozer, Marvin Heemeyer (not pictured) poured 4 inches of concrete between plates of steel, which he welded onto the Komatsu to armor it. Heemeyer rigged the bulldozer with video cameras equipped with air compressors to blow dust off the lenses. Images of the world outside appeared on monitors inside the enclosed cab so he could guide it without exposing himself, according to the Rocky Mountain News. He stuck three guns, including a .50-caliber rifle, out of portholes bored into the armor to keep authorities at bay. The Komatsu D355-A bulldozer had a 410-horsepower bulldozer engine and it was primed, fueled and protected by steel and concrete. It destroyed or damaged 12 buildings and caused $5 million damage. (image credit: CBS)